' There is no arcsine. Brad circles are 256 units. The radius 127. The Hypotenuse squared 16129.
' X = SQR ( H * H - Y * Y ) same as Cosine = SQR( 16129 - Sine * Sine ). Angle = Arctangent Sine/Cosine
' Altitude brad angle = arctangent (Y/X) X ATN Y
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